The Mars-Neptune synodic period is 694.911 days, or 1.90 years.

The period between such retrogradations is the synodic period of the planet.

Analysis reveals a possible synodic period of 1332 5 hours.

In the case of a planet's moon, the synodic period usually means the Sun-synodic period.

On average, this synodic period lasts 29 days, 12 hours, 44 minutes and 3 seconds.

The Saturn-Neptune synodic period is 35.869 89 years (13 101.47 days).

Coupled with a very long synodic period of more than 45 years, it takes long time to produce such a transit.

Its synodic period of over 846 earth days is among the largest of any body in the Solar System.

The time it takes to complete this period is the synodic period of the planet.

This period of time corresponds to 152 synodic periods of Venus.